import java.io.*;

public class ByteStreamDemo {
	static void copyFile(String from, String to) throws IOException   {   
		InputStream  in  = null;  
		OutputStream out = null;   
		try {      
			in  = new FileInputStream (from);  
			out = new FileOutputStream(to);   
			int c;       
			while((c = in.read())!=-1) {  
				out.write(c); 
			}   
		}     
		finally {   
			if(in != null)  
				in.close();  
			if(out != null)   
				out.close(); 
		} 
	}    
	
	static boolean testByteDataIO() throws IOException   {     
		InputStream  in  = null;  
		OutputStream out = null;    
		int    i  = 1234567890;   
		int    j  = 0;    
		double d  = 12345.6789;   
		double e  = 0.0;  
		boolean result = false; 
		try {      
			out = new FileOutputStream("data1.txt");    
			out.write(i>>24);       
			out.write(i>>16);    
			out.write(i>> 8);    
			out.write(i);      
			long ld = Double.doubleToLongBits(d);   
			out.write((int)(ld>>56));     
			out.write((int)(ld>>48));     
			out.write((int)(ld>>40));     
			out.write((int)(ld>>32));     
			out.write((int)(ld>>24));     
			out.write((int)(ld>>16));     
			out.write((int)(ld>> 8));     
			out.write((int) ld&0xff);     
			out.flush();                  
			in = new FileInputStream("data1.txt");   
			j  = in.read()<<24 |        
			in.read()<<16 |            
			in.read()<< 8 |           
			in.read();     
			ld = (long)in.read()<<56 |        
			(long)in.read()<<48 |      
			(long)in.read()<<40 |      
			(long)in.read()<<32 |      
			(long)in.read()<<24 |      
			(long)in.read()<<16 |      
			(long)in.read()<< 8 |      
			(long)in.read();    
			e = Double.longBitsToDouble(ld);    
		}    
		finally {    
			if(in != null)   
				in.close();  
			if(out != null)  
				out.close(); 
		}    
		if((i == j) && (d == e))     
			result = true;  
		return result; 
	}    
	
	static boolean testDataIO() throws IOException   {   
		DataOutputStream out = null;  
		DataInputStream  in  = null;  
		int    i  = 1234567890;    
		int    j  = 0;    
		double d  = 12345.6789;   
		double e  = 0.0;   
		boolean result = false;   
		try {        
			out = new DataOutputStream(   
					new FileOutputStream("data2.txt")  );     
			out.writeInt(i);  
			out.writeDouble(d);  
			out.flush();        
			in = new DataInputStream(   
					new FileInputStream("data2.txt")   );          
			j = in.readInt(); 
			e = in.readDouble();  
		}     
		finally {     
			if(in != null)    
				in.close();    
			if(out != null)    
				out.close();    
		}   
		if((i == j) && (d == e))  
			result = true;    
		return result; 
	}  
	
	public static void main(String[] args) throws IOException {
		copyFile(".\\test.txt", "test_copy.txt"); 
		System.out.println(testByteDataIO());    
		System.out.println(testDataIO());
	}
	  
}